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Abstract(s)
Microbial interactions in the phyllosphere have been shown to fulfil important functions for plant health. Yet, little is known about such types of microbial interactions in crop
pathosystems and if they are influence by host plant genotype. In this work the endophytic and epiphytic fungal community in olive tree leaves with and without symptoms of olive
leaf spot (OLS) disease, from three cultivars with different susceptibilities to OLS was
compared. Fungal community was analysed by culture-dependent methods. Results indicate
that fungal community differs in size and composition between asymptomatic and
symptomatic leaf, especially within epiphytic community. Endophytes varied less probably
due to complexity enhancement of interactions, since living host tissues are involved. Host
genotype had a structuring effect on the composition of fungal communities only in
asymptomatic leaves. Symptomatic leaves displayed a similar fungal community among
cultivars, which composition appears to be disease-specific. OLS disease also differentially
influenced fungal flora of the three cultivars, and the greatest differences between
asymptomatic and symptomatic leaves were observed in the tolerant cultivar. Some fungal
taxa were found to be specific to either asymptomatic or symptomatic leaves, which
suggest that they might have competitive or cooperative activity with the pathogen, within and outside leaf tissues. The role of these fungi as “pathogen antagonist” or “pathogen facilitator” must be investigated in the future.
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Pedagogical Context
Citation
Gomes, Teresa; Pereira, J.A.; Lino-Neto, Teresa; Bennett, Alison; Baptista, Paula (2018). Fungal community structure of asymptomatic and Olive leaf spot-symptomatic leaves. In 8th meeting of the IOBC-WPRS Working Group "Integrated Protection of Olive Crops: book of abstracts. Florence